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Flask: how to get session data?

I am a fairly new python web-dev, I have flash + wtforms application. I can see in the login () user object saved as

  if user:
   if user.verify_password(form.password.data):
    flash('You have been logged in')
    user.logins += 1

    db.session.add(History(user.uid))
    db.session.commit()

    session['user'] = user

Now I wanted to get a user

if 'user' in session:
       User=session.get('user')
       print User.nickname ###<< how to retrieve specific object member?

It does not work with a message like:

      Instance <User at 0x8e5a64c> is not bound to a Session; attribute refresh operation cannot proceed
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1 answer

It's simple. If you want to get a specific object, just add the variable name to the session, for example. session['nickname'].

You can set the variable in the same way by doing session['nickname'] = nickname.

In your case, you change it to the following

if 'user' in session:
    user = session['user']
    print user

if 'nickname' in session:
    nickname = session['nickname']
    print nickname

This is a simplified version of the function I use to login.

@app.route('/login', methods=['POST'])
def login():
    """Authenticate User"""
    username = request.form['username'].strip()
    nickname = request.form['nickname'].strip()
    password = request.form['password']
    try:
        if Auth().VerifyLogin(username, password):
            session['username'] = username
            session['nickname'] = nickname
        else:
            # failed to login, do something.
    except Exception as why:
        app.logger.critical('.....')
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